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https://github.com/RGBCube/serenity
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LibJS/Bytecode: Implement initial support for super member expressions
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00493687f2
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5 changed files with 137 additions and 31 deletions
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@ -1523,20 +1523,46 @@ Bytecode::CodeGenerationErrorOr<void> CallExpression::generate_bytecode(Bytecode
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if (is<NewExpression>(this)) {
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TRY(m_callee->generate_bytecode(generator));
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generator.emit<Bytecode::Op::Store>(callee_reg);
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} else if (is<SuperExpression>(*m_callee)) {
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return Bytecode::CodeGenerationError {
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this,
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"Unimplemented callee kind: SuperExpression"sv,
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};
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} else if (is<MemberExpression>(*m_callee)) {
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auto& member_expression = static_cast<MemberExpression const&>(*m_callee);
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// https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
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if (is<SuperExpression>(member_expression.object())) {
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return Bytecode::CodeGenerationError {
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this,
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"Unimplemented callee kind: MemberExpression on SuperExpression"sv,
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};
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// 1. Let env be GetThisEnvironment().
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// 2. Let actualThis be ? env.GetThisBinding().
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generator.emit<Bytecode::Op::ResolveThisBinding>();
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generator.emit<Bytecode::Op::Store>(this_reg);
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Optional<Bytecode::Register> computed_property_value_register;
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if (member_expression.is_computed()) {
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// SuperProperty : super [ Expression ]
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// 3. Let propertyNameReference be ? Evaluation of Expression.
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// 4. Let propertyNameValue be ? GetValue(propertyNameReference).
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TRY(member_expression.property().generate_bytecode(generator));
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computed_property_value_register = generator.allocate_register();
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generator.emit<Bytecode::Op::Store>(*computed_property_value_register);
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}
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// 5/7. Return ? MakeSuperPropertyReference(actualThis, propertyKey, strict).
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// https://tc39.es/ecma262/#sec-makesuperpropertyreference
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// 1. Let env be GetThisEnvironment().
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// 2. Assert: env.HasSuperBinding() is true.
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// 3. Let baseValue be ? env.GetSuperBase().
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generator.emit<Bytecode::Op::ResolveSuperBase>();
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// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: propertyKey, [[Strict]]: strict, [[ThisValue]]: actualThis }.
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if (computed_property_value_register.has_value()) {
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// 5. Let propertyKey be ? ToPropertyKey(propertyNameValue).
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// FIXME: This does ToPropertyKey out of order, which is observable by Symbol.toPrimitive!
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generator.emit<Bytecode::Op::GetByValue>(*computed_property_value_register);
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} else {
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// 3. Let propertyKey be StringValue of IdentifierName.
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auto identifier_table_ref = generator.intern_identifier(verify_cast<Identifier>(member_expression.property()).string());
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generator.emit<Bytecode::Op::GetById>(identifier_table_ref);
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}
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} else {
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TRY(member_expression.object().generate_bytecode(generator));
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generator.emit<Bytecode::Op::Store>(this_reg);
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if (member_expression.is_computed()) {
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@ -1546,6 +1572,8 @@ Bytecode::CodeGenerationErrorOr<void> CallExpression::generate_bytecode(Bytecode
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auto identifier_table_ref = generator.intern_identifier(verify_cast<Identifier>(member_expression.property()).string());
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generator.emit<Bytecode::Op::GetById>(identifier_table_ref);
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}
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}
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generator.emit<Bytecode::Op::Store>(callee_reg);
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} else {
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// FIXME: this = global object in sloppy mode.
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@ -151,6 +151,44 @@ CodeGenerationErrorOr<void> Generator::emit_load_from_reference(JS::ASTNode cons
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}
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if (is<MemberExpression>(node)) {
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auto& expression = static_cast<MemberExpression const&>(node);
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// https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
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if (is<SuperExpression>(expression.object())) {
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// 1. Let env be GetThisEnvironment().
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// 2. Let actualThis be ? env.GetThisBinding().
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// NOTE: Whilst this isn't used, it's still observable (e.g. it throws if super() hasn't been called)
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emit<Bytecode::Op::ResolveThisBinding>();
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Optional<Bytecode::Register> computed_property_value_register;
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if (expression.is_computed()) {
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// SuperProperty : super [ Expression ]
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// 3. Let propertyNameReference be ? Evaluation of Expression.
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// 4. Let propertyNameValue be ? GetValue(propertyNameReference).
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TRY(expression.property().generate_bytecode(*this));
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computed_property_value_register = allocate_register();
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emit<Bytecode::Op::Store>(*computed_property_value_register);
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}
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// 5/7. Return ? MakeSuperPropertyReference(actualThis, propertyKey, strict).
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// https://tc39.es/ecma262/#sec-makesuperpropertyreference
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// 1. Let env be GetThisEnvironment().
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// 2. Assert: env.HasSuperBinding() is true.
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// 3. Let baseValue be ? env.GetSuperBase().
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emit<Bytecode::Op::ResolveSuperBase>();
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// 4. Return the Reference Record { [[Base]]: baseValue, [[ReferencedName]]: propertyKey, [[Strict]]: strict, [[ThisValue]]: actualThis }.
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if (computed_property_value_register.has_value()) {
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// 5. Let propertyKey be ? ToPropertyKey(propertyNameValue).
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// FIXME: This does ToPropertyKey out of order, which is observable by Symbol.toPrimitive!
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emit<Bytecode::Op::GetByValue>(*computed_property_value_register);
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} else {
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// 3. Let propertyKey be StringValue of IdentifierName.
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auto identifier_table_ref = intern_identifier(verify_cast<Identifier>(expression.property()).string());
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emit<Bytecode::Op::GetById>(identifier_table_ref);
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}
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} else {
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TRY(expression.object().generate_bytecode(*this));
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if (expression.is_computed()) {
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@ -168,6 +206,7 @@ CodeGenerationErrorOr<void> Generator::emit_load_from_reference(JS::ASTNode cons
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"Unimplemented non-computed member expression"sv
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};
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}
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}
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return {};
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}
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VERIFY_NOT_REACHED();
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@ -76,6 +76,7 @@
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O(PutById) \
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O(PutByValue) \
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O(ResolveThisBinding) \
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O(ResolveSuperBase) \
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O(Return) \
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O(RightShift) \
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O(ScheduleJump) \
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@ -530,6 +530,26 @@ ThrowCompletionOr<void> ResolveThisBinding::execute_impl(Bytecode::Interpreter&
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return {};
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}
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// https://tc39.es/ecma262/#sec-makesuperpropertyreference
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ThrowCompletionOr<void> ResolveSuperBase::execute_impl(Bytecode::Interpreter& interpreter) const
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{
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auto& vm = interpreter.vm();
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// 1. Let env be GetThisEnvironment().
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auto& env = verify_cast<FunctionEnvironment>(*get_this_environment(vm));
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// 2. Assert: env.HasSuperBinding() is true.
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VERIFY(env.has_super_binding());
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// 3. Let baseValue be ? env.GetSuperBase().
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auto base_value = TRY(env.get_super_base());
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// 4. Let bv be ? RequireObjectCoercible(baseValue).
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interpreter.accumulator() = TRY(require_object_coercible(vm, base_value));
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return {};
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}
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ThrowCompletionOr<void> GetNewTarget::execute_impl(Bytecode::Interpreter& interpreter) const
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{
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interpreter.accumulator() = interpreter.vm().get_new_target();
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@ -1383,6 +1403,11 @@ DeprecatedString ResolveThisBinding::to_deprecated_string_impl(Bytecode::Executa
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return "ResolveThisBinding"sv;
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}
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DeprecatedString ResolveSuperBase::to_deprecated_string_impl(Bytecode::Executable const&) const
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{
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return "ResolveSuperBase"sv;
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}
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DeprecatedString GetNewTarget::to_deprecated_string_impl(Bytecode::Executable const&) const
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{
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return "GetNewTarget"sv;
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@ -1130,6 +1130,19 @@ public:
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void replace_references_impl(Register, Register) { }
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};
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class ResolveSuperBase final : public Instruction {
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public:
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explicit ResolveSuperBase()
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: Instruction(Type::ResolveSuperBase)
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{
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}
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ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
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DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
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void replace_references_impl(BasicBlock const&, BasicBlock const&) { }
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void replace_references_impl(Register, Register) { }
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};
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class GetNewTarget final : public Instruction {
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public:
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explicit GetNewTarget()
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